I understand what you're saying. I would have to start out with a washer that is over 3/16ths thick. I won't really know what's going on till I install the head. Atleast this way they fit and once the head is on it's probably easier to add after that. There should still be enough thread to do the job. Scary in a way. Still trying to find the correct nuts. These ARP studs are 290-7201. Been looking for a matching nut number, but haven't found that yet. I might have to make a call to let them know the number so I get the correct ones.